Simutrans, as the name suggests is a transportation simulation game where goal is to establish a successful transport company.
Transport passengers, mail and goods by rail, road, ship and air. Interconnect cities, districts, public buildings, industries and tourist attractions by building a transport network you always dreamed of. Control and watch your finances and the traffic of your vehicles and goods. Start in 1880 and finish in 2050. There will be new vehicles and buildings throughout this time.
Simutrans was updated recently bringing in lots of optimizations:
Mostly bugfixes and optimisations (e.g. faster display on large windows when zooming out). Most important for game play is the fact that speed bonus now takes into account the maximum possible top speed, included speed limits imposed by ways and overloaded vehicles
If you don't know about Simutrans yet, check out the video below: